Air-inlet valve for internal-combustion engines



J. CYTY.

AIR INLET VALVE FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED NOV. 4, I919.

1,369,627. Patented Feb. 22,1921.

cfohn UNITED STAWENT QFFIQE.

JOHN CYTY, 0F BEA'ITY, NEVADA.

AIR-INLET VALVE FOR INTERNAL-GQMB USTION ENGINES. I

Application filed November 4, 1919. Serial No. 335,614.

To all whomitmay/ooncem:

Be it known that I, JOHN OYTY, a citizen of the United States, residing at Beatty, Nye county, Nevada, have invented certa1n new and useful Improvements in Air-Inlet Valves, for Internal-Combustion Engines, of which the following is a specificatlon.

My invention relates to an improved auto-' matic air intake valve adapted to be applied to the intake manifold of an internal combustion engine at a point between the carbureter and the valve chambers of the engine,

the purpose being to efi'ect a saving of fuel and to relieve the suction created in the intake manifold when the engine; is being used as a brake, or is being run at high speed.

The object of my invention is to provide a valve for this purpose applicable to various makes of internal combustion engines, and which is extremely simple and durable in its construction.

A further object of my invention is to Referring to the drawings, 5 represents an engine, which may be of any desired make, having the usual intake manifold 6 connected at the bottom to the carbureter 7. I prefer to apply the valve 8 to the intake manifold between the two branches 9 and 9 thereof in order that the air admitted through the valve may be properly distributed, but the valve may be positioned at any other desired point. v

The valve'8 comprises a body portion 10 having at one end thereof a threaded extension 11 recessed at 12, and a cup-like extension 13 on the opposite end. A plurality of flat surfaces are formed at 14 for accom modating suitable wrenches. Passing centrally through the body 10 is a valve stem 15 threaded at 16 and secured on the oppo- Patented Feb.

site end to an inverted mushroom valve 17, as shown in Fig. 8. Surrounding the valve stem 15 is a compression spring 18 having its lower end resting in the cup-shaped extension 13 and having its opposite end engag ing the under face of a nut 19 on the threaded portion of the valve stem. The spring 18 tends to'urge the valve stem upwardly to maintain the valve 17 closed, and by screwmg the nut 19 in the desired direction, the pressure of the spring may be regulated. A winged lock nut may be provided at 20. Passing through the body 10 in a diagonal direction,- are a plurality of air passages 21 leading from the outside into the recess 12.

Ifwy reason of the recess 12 being comparatively shallow, the air passages terminate very close to the outer extremity of the v threaded extension 11, or almost adjacent the valve seat. The body 10 is provided with a laterally extending flange 22.

Vhile it is contemplated that the valve may be applied to an opening tapped directly through the intake manifold I prefer to use a brass or other metal plate 23, conforming to the curvature of the intake manifold and having a threaded projecting portion 24 into which the extension 11 of the valve may be screwed until the flange 10 seats against the top of the projection. When such a plate is used, a comparatively large hole is cut in the intake manifold, said hole being at least slightly larger than the so created. Thus, a saving of fuel is effected, because were it not for the valve, air,

together with some fuel, would be drawn from the carbureter past the throttle. The valve also saves fuel by functioning in a similar manner when the engine is running at high speed by diluting the mixture from the carbureter, which, as is well known, be-

comes richer as the speed of the engine increases. According to my invention, the valve will open wider as the speed of the engine increases, thereby tending to keep the mixture more constant.

A valve constructed in accordance with the present invention is simple, compact and durable, and may be cheaply manufac- "tentto form any obstruction tothe flow of the mixture through the manifold to effect a condensation of the fuel, the valve normally lying in a plane even with the interior of the manifold. Also, by the use of diagonal 'airpassages, the valve may be made more compact and a saving of metal effected.

I claim The combination with an intake manifold having branches with an opening at' the junction of the branches, of a plate fitting between the branches and covering the opening and which is formed with a hollow internally threaded extension, a valve body having a threaded inner portion extending into and engaging the threaded extension of the plate and having also a peripheral flange bearing against the outer edge of said extension, saidbody having a plurality of'inclined air inlet channels extending into the hollow extension of the body, and a valve arranged within the threaded flange of the body and provided with a spring that V normally holds it within said hollow extension but which permits it to open inwardly. In testimony whereof I have hereunto subscribed my name. 7 V

' JOHN CYTY.

lVitnesses DONALD FINDLEY, FREDERIO CARTER, J. IRVING CRoWELL. 

